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From "Josh Wills (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CRUNCH-68) Crunch examples don't accept generic tool arguments
Date Wed, 19 Sep 2012 21:43:07 GMT

    [ https://issues.apache.org/jira/browse/CRUNCH-68?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13459130#comment-13459130
] 

Josh Wills commented on CRUNCH-68:
----------------------------------

+1-- let's commit it.
                
> Crunch examples don't accept generic tool arguments
> ---------------------------------------------------
>
>                 Key: CRUNCH-68
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-68
>             Project: Crunch
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.3.0
>            Reporter: Roman Shaposhnik
>            Assignee: Josh Wills
>             Fix For: 0.4.0
>
>         Attachments: CRUNCH-68-Fix-command-line-parser-for-examples.patch
>
>
> Currently all crunch examples have the following code:
> {noformat}
>     if (args.length != 3) {
>       System.err.println();
>       System.err.println("Usage: " + this.getClass().getName() + " [generic options]
input output");
>       System.err.println();
>       GenericOptionsParser.printGenericCommandUsage(System.err);
>       return 1;
>     }
> {noformat}
> this is incorrect since run() gets to see all arguments even generic ones and thus you
can't predict the value of 
> args.length.
> This is also, unfortunately a major blocker, for using Crunch with Hadoop 2 because of
a MAPREDUCE-4068. 
> Essentially at this point a combination of MAPREDUCE-4068 and inability to pass -libjars
makes Crunch example DOA for Hadoop 2 clusters.

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